Is it legal for sanhe city enterprises and property management companies to pay social security work-related injury insurance only to cleaning staff?

It is illegal for sanhe city enterprises and property management companies to pay social security work-related injury insurance only to cleaning staff. According to relevant information, the Social Insurance Law stipulates that employers and workers should participate in social insurance according to law, including basic old-age insurance and basic medical insurance, and can't just pay work-related injury insurance in social insurance for employees.